diff --git a/os/src/task/mod.rs b/os/src/task/mod.rs
index f03bfe4d..457d2bf9 100644
--- a/os/src/task/mod.rs
+++ b/os/src/task/mod.rs
@@ -9,7 +9,6 @@ mod action;
 mod task;
 
 use crate::fs::{open_file, OpenFlags};
-use crate::mm::translated_refmut;
 use alloc::sync::Arc;
 pub use context::TaskContext;
 use lazy_static::*;
@@ -127,7 +126,6 @@ fn call_kernel_signal_handler(signal: SignalFlags) {
 }
 
 fn call_user_signal_handler(sig: usize, signal: SignalFlags) {
-    let token = current_user_token();
     let task = current_task().unwrap();
     let mut task_inner = task.inner_exclusive_access();
 
diff --git a/user/src/bin/sig_tests.rs b/user/src/bin/sig_tests.rs
index 807f2bf4..a5cbce08 100644
--- a/user/src/bin/sig_tests.rs
+++ b/user/src/bin/sig_tests.rs
@@ -11,6 +11,17 @@ fn func() {
     sigreturn();
 }
 
+fn func2() {
+    loop {
+        print!("");
+    }
+}
+
+fn func3() {
+    println!("interrupt");
+    sigreturn();
+}
+
 fn user_sig_test_failsignum() {
     let mut new = SignalAction::default();
     let old = SignalAction::default();
@@ -113,6 +124,38 @@ fn kernel_sig_test_failignorekill() {
     }
 }
 
+fn final_sig_test() {
+    let mut new = SignalAction::default();
+    let old = SignalAction::default();
+    new.handler = func2 as usize;
+
+    let mut new2 = SignalAction::default();
+    let old2 = SignalAction::default();
+    new2.handler = func3 as usize;
+
+    let pid= fork();
+    if pid == 0{
+        if sigaction(10, &new, &old) < 0 {
+            panic!("Sigaction failed!");
+        }
+        if sigaction(14, &new2, &old2) < 0 {
+            panic!("Sigaction failed!");
+        }
+        if kill(getpid() as usize, 1 << 10) < 0 {
+            println!("Kill failed!");
+            exit(-1);
+        }
+    } else {
+        sleep(1000);
+        if kill(pid as usize, 1 << 14) < 0 {
+            println!("Kill failed!");
+            exit(-1);
+        }
+        sleep(1000);
+        kill(pid as usize, SignalFlags::SIGKILL.bits());
+    }
+}
+
 
 fn run(f: fn()) -> bool {
     let pid = fork();
@@ -133,14 +176,15 @@ fn run(f: fn()) -> bool {
 
 #[no_mangle]
 pub fn main() -> i32 {
-    let tests: [(fn(), &str); 7] = [
+    let tests: [(fn(), &str); 8] = [
         (user_sig_test_failsignum, "user_sig_test_failsignum"),
         (user_sig_test_kill, "user_sig_test_kill"),
         (user_sig_test_multiprocsignals, "user_sig_test_multiprocsignals"),
         (user_sig_test_restore, "user_sig_test_restore"),
         (kernel_sig_test_ignore, "kernel_sig_test_ignore"),
         (kernel_sig_test_stop_cont, "kernel_sig_test_stop_cont"),
-        (kernel_sig_test_failignorekill, "kernel_sig_test_failignorekill")
+        (kernel_sig_test_failignorekill, "kernel_sig_test_failignorekill"),
+        (final_sig_test, "final_sig_test")
     ];
     let mut fail_num = 0;
     for test in tests {